Electric heating element



1943- A. F. SHAFTER 5 ELECTRIC HEATING ELEMENT Filed NOV. 95 1945INVENTOR Ana/.1 F1 67/4 FTER ATTORNEYS Patented Dec. 28, 1948 UNIT EDSTATE-S PATENT OFFICE Y ans-Leos ELECTRIC. HEATING ELEMENT AdclphF'.Shatter, Decatur; Ill., lssignor to U. 8. Manufacturing: Corporation,Decatur, Ill., a corporation of Illinois Application November 9, 1945,Serial No. 627,651

This invention relates ments and primarily to elements of such characteras may be adapted for" use with common household. appliances, such asfood warmers, corn popper-s, or the like.

A principal object of the invention is to provide heating elements ofthis character that are simple and cheap to manufacture and that may bereadily and quickly assembled.

Another object of the invention is to provide heating elements of thischaracter that are rugged in construction and capableofwithstandingconsiderable abuse during use.

A further object of the invention is to provide heating elements of thischaracter in which the heating coil is safely insulated from metallicparts-to minimize danger off shock tothe user.

To the accomplishment ofrthe foregoing. and such other objects as mayhereinafter appear, this invention consists in the novel constructionand arrangement of parts'herein-after described and. then sought to bedefinedin the appended claims, reference-being had to the. accompanyingdrawing, forming. a part hereof, which shows merely for the part ofillustrative disclosure, a preferred embodiment of the invention, itbeing expressly understood, however, that changes might be made inpractice within the scope of the claims without digressing from theinventive ideas.

In the drawing:

Fig. 1 is a top plan view of the heating element, parts being brokenaway and sectionalized to illustrate details of construction; and

Fig. 2 is a side elevation of the device of Fig. 1, partially insection, to illustrate details of construction.

Referring to the drawing, I denotes a disc or plate-like member,preferably of thin metal. In the embodiment shown, this member hassubstantially circular form and is provided in its surface with aplurality of sets of'stamped out flanges or wings I3, I4 that are bentto extend laterally of the face of the plate or disc II'I. These flangesI3, I4 of each set extend parallelly with respect to each other, and thesets of flanges I3, I4 are arranged concentrically about the center ofthe disc. The flanges I3 and I4 are provided, respectively, with thefacing, vertically or longitudinally extending slots I5, I6, spacedvertically from the face of member III for a purpose presently to be,described.

An electrical resistance heating coil I1 is provided which is adapted tobe supported in spaced relationship from and by the flanges I3, I4. To

3 Claims. (CL 219-49) to electric heating elethis end, the tubularmembers I8 of insulating material such as porcelain or other ceramic orheatre'sisting' and insulating materials, are provided. Each tubularmember I8 has a surface projection, for example, in the'form of anannular enlarged portion or bead IS. The diameters of these beads I9 areadmeasured so that they will extend at opposite sides of the tubularmembers into the oppositely facing slots I5, I6 provided at each pairorset of flanges I3, III The said flanges I3, I4 possess sufficientresiliency to be spread for the insertion of the beads I9 within thesaid slots I5, I6 and to thereafterspring together' to retain thetubular members I8 s'ecurely on the flanges I3, I4. The heating element"I1 is threaded through the openings IBa in the' tubular members and;because of the concentric ar'rangementof the flanges I3, I4, the heatingcoil II extends in substantially circular form relative to the center ofthe disc but in spaced relationship therefrom. The openings IBapreferably have considerably larger diameter than the external coildiameter.

A pair of contact prongs 2|, 22 are suitably insulated from an electricplug receiving socket 23" that is attached by these prongs to a flange24 upstanding from 24 to the plate ID. The insulation 23a insulatesthese prongs from the socket 23, and similar insulation 24a insulatesthem from flange 24. The respective prongs 2|, 22 are provided withattaching flanges or lugs 25, 26, and the opposite ends of the heatingcoil H are conveniently hooked or otherwise attached in eyelets orjunctions 25a, 26a of the respective lugs 25, 26, so as to provide agood electrical joint. Inasmuch as the heating element or coil I! mustbe stretched to separate the individual windings, ordinarily enoughtension is provided by the heating coil itself to maintain goodelectrical connection with the lugs 25, 26 at the junctions 25a, 26awhen the coil ends are attached thereto.

In the assembly of the heating element construction described, thepre-stamped disc III with its sets of flanges I3, I4 has the socket 23attached thereto by the prongs or terminals 2 I, 22. Thereafter, theseassemblies are fitted with the insulating tubular members I8 and finallythe heating coils I1 are threaded through these tubular elements I8 andtheir ends joined at 25c and 26a to the lugs 25, 26 of the electricalprongs 2|, 22. The tubular elements or members I8 serve not only tosupport the heating coil II but maintain it in spaced and insulatedrelationship relative to the flanges or supports l3, I4 and the metaldisc III.

it reduces the amount of electrical energy necessary to supply therequired amount of heat for eifective heating in household units, suchas corn poppers, or food warmers, or the like.

While a specific embodiment of the invention has been disclosed, it isto be understood that changes within the scope of the claims arecontemplated. There is no intention, therefore, of.

limitation to the exact details shown and described.

What is claimed is:

1. In a device of the character described, a plate-like metallic member,pairs of parallelly arranged spaced apart flanges integral with andupstanding from a face of said member, each of the flanges having alongitudinally extending slot spaced from the said face with the slotsof the flanges of each pair of flanges extending in substantialparallellism, tubular insulating elements, said elements each having anannular projection or bead positioned at opposite sides of the elementwithin oppositely facing slots of a pair of the spaced apart flanges,with the flanges of each pair clamping a tubular element between them,each tubular element being thereby supported in spaced relationship fromsaid face of said member, an electrical heating coil threaded throughthe so supported tubular elements, electrical terminals and means forattaching said coil to said terminals.

2. In a device of the character described, a plate-like metallic member,sets of parallelly arranged spaced apart flanges upstanding from a faceof said member, each of the flanges having a longitudinally extendingslot spaced from the said face with the slots of the flanges of eachpair of flanges extending in substantial parallellism, tubularinsulating elements, said elements each having an annular projection orbead positioned at opposite sides of the element within oppositely facinparallel slots of the flanges of a set and with the flanges of each setclamping the tubular element between them whereby aplurality of saidtubular elements are supported in spaced relationship from said face ofsaid member, an elec- .trical heating coil threaded through the sosupported tubular elements, an additional flange upstanding from saidmetallic member, a plug receiving socket, electrical terminals joiningsaid socket and said last-named flange, means for insulating saidterminals from said socket and said last-named flange, and means forattaching said heating coil to said terminals.

3. Ina device of the character described, a plate-like metallic member,sets of parallelly arranged spaced apart flanges upstanding from a faceof said member, each of the flanges having a longitudinally extendingslot, with the slots of the flanges of each set extending in substantialparallellism with each other and substantially perpendicular to the faceof said plate-like member, tubular insulating elements provided withsurface projections extending into the slots of the flanges, one suchelement only being supported between flanges of a set, an electricalheating coil threaded through the tubular elements so supported, andelectrical terminals, said heating coil being joined electrically tosaid terminals.

ADOLPH F. SHAFTER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,165,451 Ruckle Dec. 28', 19151,637,391 Russell Aug. 2, 1927 1,647,346 Ehrgott Nov. 1'; 1927 2,019,780Gough Nov. 5, 1935

